The school said "all students are safe," but no one was allowed to enter or exit the building while the lockdown was in place, according to information on the school's website.
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The Code Red lockdown started around 11:30 a.m. and was changed to a Code Green just before 12:30 p.m.
School officials said parents could pick their students up early if they wanted, but they asked for patience as they worked to accommodate everyone.
Chopper11 gets aerial view of lockdown
Brentwood Magnet Elementary School on Code Red lockdown due to security concern, all students safe
This lockdown follows a series of recent lockdowns that happened at area schools over the last week.
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Zebulon Middle School and East Millbrook Middle School were put on lockdown due to security concerns on February 3.